Mobile or portable apparatus with pressurized gas supply for preparing beverages or similar products

An apparatus for preparing beverages, the apparatus comprising:

• a module for delivering a beverage by supplying a pressurized liquid;
• pressurizing means suitable for supplying the module with pressurized liquid;
• heating means for heating the liquid supplied to the module, the heating means comprising a combustion heating means;
• and
• a liquid feed chamber, of which the capacity is several times smaller than the capacity of a liquid feed tank, the chamber being arranged, in a filling configuration, to communicate with the tank in order to be filled with liquid, the chamber being arranged, in a module feeding configuration, to communicate with the pressurizing means in order to pressurize the liquid in the chamber and to inject pressurized liquid into the module and thereby permit delivery of the liquid through the module,
• wherein the pressurizing means comprises at least one autonomous reserve of pressurized gas, and
• wherein in the module feeding configuration, the gas enters into direct contact with the liquid present in the chamber while the tank remains isolated from the pressure with respect to the chamber, so that the liquid present in the tank is not subjected to the gas pressure exerted in the chamber.